REPORT DOCUMENTATION PAGE 



Form approved 

 0MB No. 0704-0188 



Public reporting concern tor the collection of information is estimated to average 1 hour per response Including the time for reviewing Instructions, searching existing 

 data sources, gathering and measuring the data needed and correcting and reviewing the collection of information. Send comments regarding this burden estimate or 

 any other aspect of this collection of information Including suggestions for reducing this burden to Washington Headquarters Services, Directorate for Information 

 Observations and Records, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302 and to the Office of Management and Support, Paperwork Reduction 

 Project (0704-01881, Washington, DC. 20S03. 



1. AGENCY USE ONLY (LEAVE BUVNK) 



2. REPORT DATE 



October 1995 



. REPORT TYPE AND DATES COVERED 



Final report 



. TITLE AND SUBTITLE 



Monitoring Cruise at the Western Long Island Soun(J Disposal Site, June 1991 



5. FUNDING NUfl/IBERS 



6. AUTHOR(S) 



R. W. Williams 



. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 



Science Applications International Corporation 

 221 Thrid Street 

 Newporl, Rl 02840 



B. PERFORMING ORGANIZATION REPORT 

 NUMBER 



SAIC-92/7623&C102 



SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 



US Army Corps of Engineers-New England Division 

 424 Trapelo Road 

 Waltham, MA 02254-9149 



10. SPONSORING/ MONITORING AGENCY 

 REPORT NUMBER 



DAMOS Contribution 

 Number 99 



11. SUPPLEMENTARY NOTES 



Available from DAMOS Program Manager, Regulatory Division 

 USACE-NED, 424 Trapelo Road, Waltham, MA 02254-9149 



12a. DISTRIBUTION/AVAILABILITY STATEMENT 



Approved for public release; distribution unlimited 



12b. DISTRIBUTION CODE 



13. ABSTRACT (MAXIMUM 200 WORDS) 



In June 1991, SAIC conducted field operations at the the Westem Long Island Sound Disposal Site (WLIS) as a part of 

 the DAMOS (Disposal Area Monitoring System) Program for the U.S. Anmy Corps of Engineers, New England Division (NED). 

 The objectives of this study were (1) to provide information on the fate and effects of dredged materials disposed since the 

 previous July 1 990 survey; (2) to assess the stability of the inactive disposal mounds; (3) to determine the extent of infaunal 

 recolonization; (4) to measure near-bottom dissolved oxygen concentrations; and (5) to collect additional PAH and metals 

 data at the three reference areas. Field operations included a 1200 x 800 m bathymetric survey, REMOTS sediment profile 

 photography, near-bottom dissolved oxygen measurements, and sediment sampling for chemical and physical analyses. 



Based on recorded disposal volumes, 86,462 m3 of material was disposed during the 1990-1991 season. The 

 resulting WLIS "E" mound was 3.0 m high with an elliptical footprint of 400 x 175 m. The WLIS "A", "B", and "C" mound 

 heights remained unchanged since the previous July 1990 bathymetric survey and were considered to be stable. The height of 

 the WLIS "D" mound decreased approximately 0.5 m, primarily due to the consolidation of the mound sediments. 



Infaunal recolonization of the recently deposited material occurred rapidly as 90% of the on-site stations provided 

 evidence on Stage III activity. Several stations west of the WLIS "D" mound continued to exhibit low reflectance subsurface 

 sediments although the recolonization status was normal. Low reflectance, inferred to represent sediments from the previous 

 year's survey with high oxygen demand, indicated potential deleterious effects of disposal operations and therefore, warranted 

 further investigation. 



Dissolved oxygen and sediment chemistry were analyzed at three WLIS reference areas (2000W, 2000S, and WLIS- 

 REF). Concentrations of dissolved oxygen in near-bottom waters at the disposal site and reference areas were spatially 

 homogeneous and within aerobic levels. REMOTS parameters indicated that reference areas 2000S and WLIS-REF had 

 received disposed material in the past, whereas reference area 2000W had benthic habitat conditions characteristic of ambient 

 sediments. Sediment chemistry analyses reflected this disparity among the three reference areas, with the highest 

 concentrations of PAH's and metals occurring at 2000S and the lowest concentrations occurring at 2000W. Consideration 

 should be made to replace reference areas 2000S and WLIS-REF (as comparison areas for the disposal site) with areas 

 deemed not affected by historical disposal operations. 



U. SUBJECT TERMS 



WLIS SAIC DAMOS disposal mounds dissolved oxygen REMOTS PAH's 



15. NUMBER OF PAGES 

 45 



16. PRICE CODE 



17. SECURITY CLASSIFICATION OF REPORT 18. SECURITY CLASSIFICATION OF THIS 19. SECURITY CLASSIFICATION OF 



Unclassified page abstract 



20. LIMITATION OF ABSTRACT 



